Download aap2 and bundletool as part of required dependencies.

In order to fix the roll https://webrtc-review.googlesource.com/c/src/+/108200,
this CL updates webrtc DEPS to be on a par with chromium's CL:
"Android build: Add bundletool and newest aapt2 binaries to chromium src"
https://chromium.googlesource.com/chromium/src.git/+/4ff35dfa790d9d2155fc8367c0ad30e1a0cc1dc6#

Bug: chromium:845405
Change-Id: I768b65b34d2a55bbfdf48acb4766b3e9c04de218
Reviewed-on: https://webrtc-review.googlesource.com/c/108280
Commit-Queue: Yves Gerey <yvesg@webrtc.org>
Reviewed-by: Artem Titov <titovartem@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25409}

DEPS

diff --git a/DEPS b/DEPS
index c54d5e5..8128f07 100644
--- a/DEPS
+++ b/DEPS
@@ -69,6 +69,29 @@
     'url': Var('chromium_git') + '/android_tools.git' + '@' + '130499e25286f4d56acafa252fee09f3cc595c49',
     'condition': 'checkout_android',
   },
+
+  'src/third_party/android_build_tools/aapt2': {
+      'packages': [
+          {
+              'package': 'chromium/third_party/android_tools_aapt2',
+              'version': 'version:3.2.0-alpha18-4804415-cr0',
+          },
+      ],
+      'condition': 'checkout_android',
+      'dep_type': 'cipd',
+  },
+
+  'src/third_party/android_build_tools/bundletool': {
+      'packages': [
+          {
+              'package': 'chromium/third_party/android_tools_bundletool',
+              'version': 'version:0.4.2-cr0',
+          },
+      ],
+      'condition': 'checkout_android',
+      'dep_type': 'cipd',
+  },
+
   'src/third_party/auto/src': {
     'url': Var('chromium_git') + '/external/github.com/google/auto.git' + '@' + '8a81a858ae7b78a1aef71ac3905fade0bbd64e82',
     'condition': 'checkout_android',